WASP-17

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WASP-17
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 15h 59m 51s
Declination –28° 03′ 42″
Apparent magnitude (V) 11.500[1]
Characteristics
Spectral type F6V
Astrometry
Distance ~1,000 ly
(~300 pc)
Details
Mass 1.2 M
Radius 1.38 R
Surface gravity (log g) 4.14 ± 0.03[2] cgs
Temperature 6509 ± 86[2] K
Metallicity [Fe/H] –0.02 ± 0.09[2] dex
Rotational velocity (v sin i) 10.6 ± 1.3[2] km/s
Age Gyr
Other designations
1SWASP J155950.94−280342.3,
USNO-B1.0 0619-0419495,
2MASS 15595095−2803422
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

WASP-17 is an F-type main sequence star approximately 1,000 light-years away in the constellation Scorpius.[3][4] As of 2009, an extrasolar planet has been confirmed to orbit the star. The planet is thought to orbit in a retrograde orbit (in the opposite direction to the star's rotation).

Planetary system[edit]

Main article: WASP-17b

The star is unusual in that it has an orbiting exoplanet, WASP-17b,[5][6] which is believed to orbit in the opposite direction to the star's spin and is said to be twice the size of Jupiter, but half its mass.

The planet was discovered by the SuperWASP project, hence the name.

The WASP-17 system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.486 (± 0.032) MJ 0.0515 (± 0.00034) 3.735438 (± 6.8e-06) 0.028 +0.018
−0.015

References[edit]